Dyeing process.



JUAN ANIBAL DOMINGUEZ, OF BUENOS AIRES, ARGENTINA.

DYEING- PROCESS.

No Drawingz. Application filed October 9, 1911, Serial No. 653,737.

Specification of Letters Patent.

Patented Dec. 22, 1914.

Renewed July 16, 1914. Serial No.

To all whom it may concern Be it known that I, JUAN ANIBAL DOMIN- oUEz,a citizen of Argentina, residing at Buenos Aires, Argentina, haveinvented a certain new and useful Dyeing Process.

This invention relates to a new method for dyeing articles by means of anatural dye extracted from wood or from the saw dust of said wood.

An object of the invention is to utilize chemical extracts of theexudations and the sawdust of the algarroba tree for dyeing purposes.

Other objects will be more clearly un derstood from the followingspecification and from the appended claim.

The exudations of the algarroba tree (Prosopz's alba and Prosopz'sm'gmmt) can be used as dye stuffs in a similar manner as the exudationsof the quebracho oak (Lowopzferygz'um Lorentzii). The exudations ofthese trees are distinguished by their tannic acid and have been usedfor dyeingas well as for tanning purposes. These exudations, usuallycalled catechin, contain catechin acid. In analyzing the kino, orexudation of the white algarroba tree, I found that the same has thefollowing composition: water, 11.149%; ash, 10.2127 tannic acid,16.240970; catechin, coloring and extracting matter, 28.420 7globafenos, 10.170%; insoluble residue, 23.80975.

In applying the same for industrial purposes the exudations in mixturewith the sawdust of the tree may be used for obtaining the followingcoloring: First: the kino and extract of sawdust of the algarroba treewith a solution of chlorid and carbonate of soda will furnish a wine redcoloring. Second: the same substance in combination with copper sulfatewill furnish dark brown coloring. Third: the same substance incombination with potassium bi-chromate will give a brown coloring.Fourth: with a solution of sub-acetate of lead, a slate gray coloringmay be obtained. Fifth: the same substance with a potassium bisulfatewill give a reddish brown tint.

In the following I have illustrated by way of example a method forcoloring textile fabrics a reddish brown tint. The

method is the following: The kino of the algarroba tree is dissolved inwater or an aqueous extract of the sawdust of the tree may be used. Thematerial to be dyed the fibers of which may be wool, sill: or cotton,are immersed in this solution or extract for a period of fifteenminutes. It is then removed from this solution and treated, pref-Verably also for a period of fifteen minutes. in a solution of bi-sulfateof potassium and perchlorid of iron. This last named solution has atemperature of 70 to 80 centigrades. The material is then removed fromthe second solution and washed.

The composition of the second bath for the material is given in thefollowing: bisulfate of potassium. 15 grs.; per-chlorid of iron, (at 20%solution.) 20 drops; water, 100 c. c.

Another way of applying the dye to the material is given in thefollowing method: The material to be treated is immersed in a solutionof alum having a strength of 5% and a temperature of 70 to 80 degreescentigrade. After having been left in this solution for fifteen minutesthe material is with drawn and washed in water for a like period. It isthen immersed for fifteen minutes in a solution of kino of the algarrobatree in water or in an aqueous extract of the sawdust of the tree. Afterthis treatment the material may be washed again and may be immersedafterward in a cold bath consisting of a 10% aqueous solution ofpotassium bi-chromate. After being treated in the second solution forfifteen minutes it is removed. washed and dried.

I claim:

A method of dyeing material which comprises immersing the material to bedyed in an aqueous solution of the kino of the algarroba tree (Prosom's(Alba or Prosom's nip ml. washing the material and immersing the same ina solution of metallic salts in water.

In testimony whereof I affix my signature in presence of two witnesses.

JUAN ANIBAL DOMINGIIEZ.

IVitnesses Josii A. GUINAZU, ELI TAYLOR.

copies of this patent may be obtained for live cents each. by addressingthe Commissioner of Patents,

Washington, D. G.

